Cylinder and drum handling

Phosgene is most readily obtained as a liquified gas stored under pressure, in steel cylinders of various sizes. The pressure, under normal conditions, may vary between about 1-2 bar depending upon the ambient temperature (see Chapter 6) and the type and concentration of impurities (see Chapter 4). In the United Kingdom, the smaller 3 lb (1 kg) and 9 lb (4 kg) cylinders are painted black with blue and yellow bands at the shoulder (see Fig. 3.1). 

For most laboratory work, the smallest available size of cylinder (e.g. lecture bottles) should be employed. This should be operated in a cool place, inside the fume cupboard. If the valve of a new cylinder is difficult to open, the cylinder should be cooled in ice to suppress the pressure before continuing the effort to open the valve. If undue force would be necessary to open the valve, then the cylinder should be rejected. As in standard laboratory 

It is recommended that the cylinder temperature should never exceed 122 F (50 C) [1318,1347,1486]. The cylinder valve should be closed after use, and when the cylinder is empty. Cylinders may be heated by warm air or warm water to facilitate the removal of the 

Specifications for phosgene cylinders have been described [1318] and should be constructed according to regulatory standards, such as British Standard 5405 [277a]. 

Recommendations for the design, construction, testing, filling and maintenance of containers 

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